FDNY Z51 RMO practice questions
the efficiency of the refrigerant cycle is affected by the lowering the condenser pressure
operation of the condenser. Of the following, a more
efficient centrifugal compressor operation results from
In most semi hermetic compressors, the suction vapor is cools the motor
used for
The amount of refrigerant that flows through the orifices difference between the high side and the low side pressure
of an economizer is determined by the
the instalation of an inline refrigerant cleaning system is to remove impurities from the system
advisable
a refrigerant engineer verifies that a condenser pump is a faulty cooling tower water level controller
cavitation of the following the most likely cause for this
condition is:
when an expansion valve is operating properly, at the only superheated vapor
end of the evaporator will contain
a centrifugal water pump is considered to be fully primed the pump is full of liquid
when
A refrigeration compressor has failed to turn on. the temperature and pressure controls
engineer on duty verifies the electrical circuit to the
motor, including all switches and circuit breakers is
complete, according to recomended service practice, the
next item to be checked would likely be the:
Refrigerants are characterized by their physical ammonia
properties including Flashpoint, refrigeration effect and
others, of the refrigerants in commercial and industrial
the highest latent heat and refrigerant effect is:
which of the following ashrae refrigerant safety b3
classification is the most toxic
which of the following ashrae refrigerant safety a3
classification is the most flammable
in q indirect refrigeration system,of the following, the one r 22 (cooling medium= glycol or any brine solution)
that would not be used as a cooling medium for building
spaces being cooled is
the primary way of achieving capacity control of a an adjustment to the inlet impeller pre rotation vanes
centrifugal compressor is by:
regarding the functioning of a steam turbine, why is it keeps turbine blades wear to minimum
advisable to keep moisture in the inlet low as possible
a water chiller is equipped with a reciprocating high suction super heat
compressor, a thermostatic expansion valve and a an air
cooled condenser. A restriction in the refrigerant line
would result in
, FDNY Z51 RMO practice questions
the process by which refrigerant is extracted and cleaned recycle
for reuse without requirements for reclamation is called
the purpose of wear rings in a centrifugal pump is to prevent wearing of the pump housing and impeller
a centrifugal compressor is in operation with suction 1.39
pressure is 3 psig and the discharge is 10psi what is the
atmospheric pressure is 14.7 which is the ratio closest to
electrical current us measured in amperage
how would you put an additional pump online open suction valve, open discharge valve gradually
of the following, the major advantage of a shell and coil there is less danger of developing leaks
condenser is
an engineer needs to vary the flow of refrigerant in a solenoid valve
refrigeration system, which operation in the flow of the
system does not include
thermal bull is attached to the suction plate between the flood the evaporator
evaporator cokl and the compressor by an insulated line.
assume that the machine room is 85deg f . break down
of the insulation results in:
water and moisture is serious problem in a refrigerant proper evaluation at the charging of the system
system how to avoid
while on duty a refrigeration engineer notic That the There is not enough Refrigerant in the system
suction line to the compressor and part of the
compressor itself is frosted over the following the most
likely reason for this condition would be
While doing a routine inspection the engineer notices the The outlet end of the coil
bulb of the TXV on the floor. The refrigerant engineer
should have attached a bulb at the
A refrigerant engineer verifies that a chilled water pump Water leaks through the mechanical seals
is cavity to of the following the most likely cause for this
condition is
The only refrigerant/temperature chart available to a 39.2
refrigeration engineer lists the temperature In ﾟC if the
chart indicates a Celsius temperature of 4ﾟ this is
equivalent to
The use of oil in the refrigeration machine is to Reduce wear and friction in the compressor parts
Which of the following will connect to the Middle port on Vacuum pump
a gauge manifold
the efficiency of the refrigerant cycle is affected by the lowering the condenser pressure
operation of the condenser. Of the following, a more
efficient centrifugal compressor operation results from
In most semi hermetic compressors, the suction vapor is cools the motor
used for
The amount of refrigerant that flows through the orifices difference between the high side and the low side pressure
of an economizer is determined by the
the instalation of an inline refrigerant cleaning system is to remove impurities from the system
advisable
a refrigerant engineer verifies that a condenser pump is a faulty cooling tower water level controller
cavitation of the following the most likely cause for this
condition is:
when an expansion valve is operating properly, at the only superheated vapor
end of the evaporator will contain
a centrifugal water pump is considered to be fully primed the pump is full of liquid
when
A refrigeration compressor has failed to turn on. the temperature and pressure controls
engineer on duty verifies the electrical circuit to the
motor, including all switches and circuit breakers is
complete, according to recomended service practice, the
next item to be checked would likely be the:
Refrigerants are characterized by their physical ammonia
properties including Flashpoint, refrigeration effect and
others, of the refrigerants in commercial and industrial
the highest latent heat and refrigerant effect is:
which of the following ashrae refrigerant safety b3
classification is the most toxic
which of the following ashrae refrigerant safety a3
classification is the most flammable
in q indirect refrigeration system,of the following, the one r 22 (cooling medium= glycol or any brine solution)
that would not be used as a cooling medium for building
spaces being cooled is
the primary way of achieving capacity control of a an adjustment to the inlet impeller pre rotation vanes
centrifugal compressor is by:
regarding the functioning of a steam turbine, why is it keeps turbine blades wear to minimum
advisable to keep moisture in the inlet low as possible
a water chiller is equipped with a reciprocating high suction super heat
compressor, a thermostatic expansion valve and a an air
cooled condenser. A restriction in the refrigerant line
would result in
, FDNY Z51 RMO practice questions
the process by which refrigerant is extracted and cleaned recycle
for reuse without requirements for reclamation is called
the purpose of wear rings in a centrifugal pump is to prevent wearing of the pump housing and impeller
a centrifugal compressor is in operation with suction 1.39
pressure is 3 psig and the discharge is 10psi what is the
atmospheric pressure is 14.7 which is the ratio closest to
electrical current us measured in amperage
how would you put an additional pump online open suction valve, open discharge valve gradually
of the following, the major advantage of a shell and coil there is less danger of developing leaks
condenser is
an engineer needs to vary the flow of refrigerant in a solenoid valve
refrigeration system, which operation in the flow of the
system does not include
thermal bull is attached to the suction plate between the flood the evaporator
evaporator cokl and the compressor by an insulated line.
assume that the machine room is 85deg f . break down
of the insulation results in:
water and moisture is serious problem in a refrigerant proper evaluation at the charging of the system
system how to avoid
while on duty a refrigeration engineer notic That the There is not enough Refrigerant in the system
suction line to the compressor and part of the
compressor itself is frosted over the following the most
likely reason for this condition would be
While doing a routine inspection the engineer notices the The outlet end of the coil
bulb of the TXV on the floor. The refrigerant engineer
should have attached a bulb at the
A refrigerant engineer verifies that a chilled water pump Water leaks through the mechanical seals
is cavity to of the following the most likely cause for this
condition is
The only refrigerant/temperature chart available to a 39.2
refrigeration engineer lists the temperature In ﾟC if the
chart indicates a Celsius temperature of 4ﾟ this is
equivalent to
The use of oil in the refrigeration machine is to Reduce wear and friction in the compressor parts
Which of the following will connect to the Middle port on Vacuum pump
a gauge manifold
